As far as I know cashmere goats are not big milk producers, they are raised mostly for their fiber. Dairy goats, i.e. saanen's,oberhasli's, nubians, etc., all have some cashmere as their inner fur, but not enough to use for spinning.

I could do that! I could get a couple of dairy goats for milk, a few other goats for cashmere an a few sheep for wool. What's a few more critters, more or less? They're no trouble, if you're not milking them.